I think lasers are pretty wack when you think about them through this lens. A small, wand-like object in your hand can make light appear from seemingly nowhere. If it’s powerful enough it can set things on fire or blind people. Not to mention larger ones like laser cutters or the LLD, used to destroy missiles midflight. Thats sure to blow some feudal peasant minds
Just about anything to do with a smart home. I can control lights and appliances in my home from anywhere in the world using my phone (magical) or just my voice.
Also appliances of most any type. A refrigerator magically contains winter all year 'round, a heater, oven and electric cooktop provide heat without the fire, and a microwave heats things without heat.